diff --git a/internal/entity/models/aliyun.go b/internal/entity/models/aliyun.go
index a1ddd6dddb..3ec313e1f0 100644
--- a/internal/entity/models/aliyun.go
+++ b/internal/entity/models/aliyun.go
@@ -71,7 +71,12 @@ func (z *AliyunModel) ChatWithMessages(modelName string, messages []Message, api
 		region = *apiConfig.Region
 	}
 
-	url := fmt.Sprintf("%s/%s", z.BaseURL[region], z.URLSuffix.Chat)
+	baseURL, ok := z.BaseURL[region]
+	if !ok || baseURL == "" {
+		return nil, fmt.Errorf("aliyun: no base URL configured for region %q", region)
+	}
+
+	url := fmt.Sprintf("%s/%s", strings.TrimSuffix(baseURL, "/"), z.URLSuffix.Chat)
 
 	// Convert messages to the format expected by API
 	apiMessages := make([]map[string]interface{}, len(messages))
@@ -207,7 +212,12 @@ func (z *AliyunModel) ChatStreamlyWithSender(modelName string, messages []Messag
 		region = *apiConfig.Region
 	}
 
-	url := fmt.Sprintf("%s/%s", z.BaseURL[region], z.URLSuffix.Chat)
+	baseURL, ok := z.BaseURL[region]
+	if !ok || baseURL == "" {
+		return fmt.Errorf("aliyun: no base URL configured for region %q", region)
+	}
+
+	url := fmt.Sprintf("%s/%s", strings.TrimSuffix(baseURL, "/"), z.URLSuffix.Chat)
 
 	// Convert messages to API format
 	apiMessages := make([]map[string]interface{}, len(messages))
@@ -573,7 +583,12 @@ func (z *AliyunModel) ListModels(apiConfig *APIConfig) ([]string, error) {
 		region = *apiConfig.Region
 	}
 
-	url := fmt.Sprintf("%s/%s", z.BaseURL[region], z.URLSuffix.Models)
+	baseURL, ok := z.BaseURL[region]
+	if !ok || baseURL == "" {
+		return nil, fmt.Errorf("aliyun: no base URL configured for region %q", region)
+	}
+
+	url := fmt.Sprintf("%s/%s", strings.TrimSuffix(baseURL, "/"), z.URLSuffix.Models)
 
 	// Build request body
 	reqBody := map[string]interface{}{}